Operating System (OS)
Which is the layer of a computer system between the hardware and the user program

None
System environment
Operating environment
Operating system

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Operating System (OS)
Addressing structure

All of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
defines the fundamental method of determining effective operand addresses
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

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Operating System (OS)
Operating system

enables the programmer to draw a flowchart
None of these
All of these
provides a layered, user-friendly interface
links a program with the subroutines it references

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